The BBB Semi-Integrated Tapered BHP-55 Headset is a premium workshop-grade component engineered to restore smooth, precise, and friction-free steering control to your bicycle. Designed specifically for modern frames utilizing a tapered head tube configuration, this zero-stack (ZS) headset presses internal cups completely flush inside the frame, minimizing the stack height while maximizing frontend stiffness. Whether you are rebuilding a rugged mountain bike, updating a gravel rig, or replacing a gritty commuter headset, the BHP-55 provides a stable, slop-free interface between your fork and frame.
At the core of this headset's exceptional longevity are high-grade chromium-molybdenum (CrMo) steel cartridge bearings. These bearings feature premium seals that lock out water, fine trail dust, and road grit, preventing the premature pitting and corrosion that leads to rough, index-style steering. The engineering is highly user-friendly, featuring an open crown race design that allows for seamless, scratch-free installation over your fork steerer tube without needing specialist slide-hammer installation tools. Topped off with a sleek 15mm aluminium cone spacer, the BHP-55 delivers a neat, integrated look that stands up to the harshest Australian riding conditions.
Premium CrMo Sealed Bearings: High-tensile steel cartridge bearings are robustly sealed against water intrusion and grinding dirt to ensure long-term, silk-smooth rotation.
Zero-Stack Semi-Integrated Profile: Keeps your handlebar cockpit low and tight while reinforcing front-end frame stiffness under heavy braking forces.
Open Crown Race Architecture: Designed with a split/open crown race to allow fast, tool-free installation and removal over the fork steerer without damage.
Aluminium Cone Spacer: Supplied with a matching 15mm black anodised alloy top cap cover to neatly shield the upper assembly from sweat and rainwater.
Universal Serviceability: Utilises standard, industry-recognised cartridge sizes (BHP-182 and BHP-185), making sourcing replacement bearings incredibly straightforward down the line.
Model Number: BHP-55
Headset Type: Zero Stack (ZS) / Semi-Integrated Tapered
S.H.I.S. Upper: ZS44/28.6
S.H.I.S. Lower: ZS55/40
Headtube Upper Inner Diameter: 44mm
Headtube Lower Inner Diameter: 55mm
Fork Steerer Size: 1 1/8" Top to 1.5" Bottom (Tapered)
Bearing Material: Sealed Cartridge Chromium-Molybdenum (CrMo) Steel
Cone Spacer Height: 15mm
Cone Spacer Diameter: 50mm
Weight: 111g
Steering Feels Notchy or Gritty: Perfect if your bike’s current front end feels rough when turning or has developed annoying play that rattles over bumps.
Ride a Tapered Frame Overhaul: Ideal if you are building or refreshing a modern mountain bike, gravel frame, or urban commuter using a 44mm top and 55mm bottom headtube.
Do Your Own Home Mechanics: The split, open crown race makes this an absolute dream for home mechanics who do not own a workshop press or a dedicated crown race setting tool.
Ride in Harsh, Wet Conditions: Excellent for year-round commuters and muddy trail riders who need heavily sealed steel bearings that can survive road spray and frequent bike washes.
Want a Low-Profile Cockpit: Great if you prefer a clean, flush aesthetic that doesn't add unnecessary stack height beneath your stem.
Run a Straight 1 1/8" Steerer Fork: Built strictly for tapered fork steerer tubes (1.5" base); it will not secure a traditional straight-steerer fork without a conversion crown race.
Own a 56mm Lower Head Tube Frame: This model uses a 55mm lower cup (ZS55); many modern mountain bikes utilize a ZS56 standard which will cause this cup to sit too loose.
Frame Uses Fully Integrated Bearings: If your carbon or alloy frame has integrated bearing seats premoulded directly inside the frame (IS42/IS52), you cannot press these separate Zero Stack cups into your frame.
When installing the BBB BHP-55 headset cups into your frame, never use a hammer and a block of wood to force them in, as you run a high risk of cocking the cups and ovalising your frame's headtube. Instead, apply a generous layer of high-quality waterproof grease to the inside of the frame's headtube and use a proper headset press tool. Once pressed flush, pack the outside of the rubber bearing seals with a thick marine grease before popping the top cap on. This extra grease barrier acts like a physical moat, stopping salty sweat from your handlebars and front wheel road grime from ever reaching the bearing surfaces, doubling the lifespan of your headset!
